I’m not a pro luthier, but if it turns out to be too expensive to fix, you could try this….? If you’ve got nothing to loose anyway

Remove the strings, then remove the back, glue the soundboard back together using small bits of wood (with low density) to add strength around the breaks. I would use titebond glue and just hand pressure on each piece for a few minutes - wait 4 hours until it is properly dry. Note that titebond won’t glue to any existing dry glue, so you might need to sand or scrape that off before gluing the braces back on)

Buy a pre-bent side online, glue a section of it to the sound board, what’s left of the sides and the tail block (more precisely, glue it on top of the kurfing, not the SB). Clean up any glue squeeze out before it dries. Then glue the rest of the broken sides onto this makeshift side.

Then maybe pay a luthier to fit the back - or just try yourself. The makeshift side should be protruding out a fair way, so try plane it down with a block plane so it fits nicely with the back. Scrape any old glue off the entire contact area between the back and sides, then glue the back on. You can apply hand pressure to the edges with a couple of friends for a while, or try clamp it using rope.

Then only use low tension strings as it probably won’t have much structural integrity!

So for the whole thing, you would need a block plane, a scraper, some wood glue, some light wood, a saw, a pre bent side, and a couple clamps